Tubbing for shafts



May a, 1923.

F. REICHARD TUBBING FOR SHAFTS Filed Feb. 14'. 1921 Patented May 8, 1%23.

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rnrrz nnrorraan. or Essen,

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,IE-RUZ'IR, GERMANY.

TUTBBING roe; arrears.

Application filed February 1 1921. Serial No. ddefid."

To all whom 2'25 may concern:

Be it known that I, Fnrrz Rnrormnn, residing at Essen, Germany, a citizen of the German Republic. have invented a certain 5 new and useful Improvement in Tubbing for Shafts, of which the following is a specification.

This invention relates to the tubbing of shafts and has for its object to provide tubbings possessing not only a high power of resistance to the all-round lateral earth pressure, but also an increased resisting capacity to the stresses caused by bending moments.

The invention will be further described with reference to the accompanying drawing which shows, as an embodiment of the subject matter of the invention, a wrought iron tubbing by way of example.

In the drawing Fig. 1 is a view, partly in section, of a single shaft ring, looking in a diametrical direction, and

Fig. 2 is a view, partly in section, on line 2-2 in 1. disclosing half of the shaft ring, seen from above.

Referring to this drawing the shaft rings are composed of single arcuate sections connected to each other at the joints A. Each arcuate section substantially consists of an external boom plate B and an internal boom plate B (each of which forms part of a cylindrical shell), as also of two web plates C connecting the boom plates B and B and having the shape of an annular sector and angularly flanged at their outer edges. These four plates are connected to each other so as to constitute an arcuate box girder. The web plates C are provided with openings 0 and project in the direction toward the interior of the shaft beyond the internal boom plates B which are completely lodged between them and moreover form, by their edge portions 6 extending into the interior of the shaft and connected by angle irons to the internal boom plates B the flanges intended for the connection of the shaft rings to each other. The walls of the box-shaped structure forming each arcuate girder are interconnected by a plurality of reinforcing plates D, shaped by stamping and distributed along the whole length of the girder. Said reinforcing plates 1) are likewise provided with openin s 6Z he hereinbefore-described shaft rings are built in by the arcuate'portions being singly inserted. in the shaft, where they are connected up to the arcuate portions adjoining them above and at the side. The openings formed in the Web plates and in the reinforcing plates facilitate the assembling operation and moreover afiordthe possibilityof filling the hollow portions of the girder with cement, if desired.

The improved form of tubbing distin Quishes itself from the known forms of tubbing by increased strength. For as the allround acting lateral earth pressure does not uniformly uponthe entire circumference of the shaft, the cross section of the ring is not only subject to compression, but, in addition, bending stresses come to work which are'liable to attain veryhi'gh values. The

' width of the box girders resulting from the distance between the two boom plates B and B of the improved shaft ring offers an increased resisting capacity against the said bending stresses. This strength of the tubbing is still further enhanced by the rein forcing plates D which effectually prevent a deformation of the rectangular crosssec tion of the box girder. The mutual position of the shaft ringsis besides specially safeguarded by the fact that the connection of the flanges 0 serving to rigidly unite the shaft rings arnong each other, with the box girder offers a very high resistingcapacify, and this owing to the fact that said flanges form a part of the web plates C- which latter project towards the interior of the shaft T Claims. i 1. A shaft tubbing formed in rings, each ring comprising a multiplicity of boxv q shaped g1I'd8IS,'Q&Ch girder comprlslng spaced external and internal boom walls and web walls connecting said boom walls at the top and bottom and coherent therewith along terruptions.

2. A shaft tubbing formed in rings, each ring comprising a multiplicity of boxshaped sheet metal girders, each girder comprising spaced boom plates, web plates connecting said boom plates and projecting toward the interior of the ring and beyond the internal boom plates.

3. A shaft tubbing formed in rings, each ring comprising a multiplicity of boxshaped girders, each. girder comprising an I their whole length without in- 1 external and internal boom plate, WQb'PlfltBS connecting said boom plates and flanged reinforcing plates secured atspaced intervals in said hollow girders.

4;. A shaft cribbing formed in rings, ring comprising a multiplicity of arcnate girders, each girder comprising spaced par allel boom plates, flanged arcuate Web plates connecting said boom plates at their ends and "forming a box-shaped structure, said Web plates extending beyond the boom plate disposed toward the interior or the ring and er eh esa roe reinforcing plates formed with flanges at their edges disposed at spaced intervals along the interior of said bOX-fiillttped gird- 15 crs.

The foregoing specification signed at Essen, Germany, this 15th day of December, 1920.

FRITZ REICHARD.

In presence 0i- HANS GOTTSMANN 7 JOHANN Dncnnns. 

